Additional information

Heroku

Using Devise on Heroku with Ruby on Rails 3.2 requires setting:

config.assets.initialize_on_precompile = false

Read more about the potential issues at http://guides.rubyonrails.org/asset_pipeline.html

Warden

Devise is based on Warden, which is a general Rack authentication framework created by Daniel Neighman. We encourage you to read more about Warden here:

https://github.com/hassox/warden

DEVISE_ORM

BUNDLE_GEMFILE

We can use this variable to tell bundler what Gemfile it should use (instead of the one in the current directory). Inside the gemfiles directory, we have one for each version of Rails we support. When you send us a pull request, it may happen that the test suite breaks on Travis using some of them. If that's the case, you can simulate the same environment using the BUNDLE_GEMFILE variable. For example, if the tests broke using Ruby 2.4.2 and Rails 4.1, you can do the following:

rbenv shell 2.4.2 # or rvm use 2.4.2
BUNDLE_GEMFILE=gemfiles/Gemfile.rails-4.1-stable bundle install
BUNDLE_GEMFILE=gemfiles/Gemfile.rails-4.1-stable bin/test

You can also combine both of them if the tests broke for Mongoid:

BUNDLE_GEMFILE=gemfiles/Gemfile.rails-4.1-stable bundle install
BUNDLE_GEMFILE=gemfiles/Gemfile.rails-4.1-stable DEVISE_ORM=mongoid bin/test